He wrote in a tweet posted this morning: ‘Mini-sub is ready if needed. It is made of rocket parts & named Wild Boar after kids’ soccer team. Leaving here in case it may be useful in the future. Thailand is so beautiful.’

Elon Musk who has said he would send engineers to help the young footballers trapped in a cave in Thailand (Picture: PA)

A device by Elon Musk’s SpaceX and The Boring Company being tested in a pool in California (Picture: REUTERS)

Thai Navy SEALS divers have already rescued eight of the boys.

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Four boys and the coach are still trapped deep inside, and authorities have indicated they’re continuing with their so-far successful effort to bring the boys out guided by experienced divers.

Officials said they were thankful to Musk for his help but said there was no chance of using the mini sub to rescue the remaining boys.

Chiang Rai Gov. Narongsak Osatanakorn said he was thankful for Musk’s support but the equipment was impractical for the rescue mission.